Solve
-10 < 2x + 4 < 10
like you would solve a regular inequality. Whatever you do to the middle part to get x by itself, do also to the left side and right side.
First, subtract 4 from all three parts:
-14 < 2x < 6
Now divide all parts by 2
-7 < x < 3
The above inequality means that x is greater than -7 and less than 3.